
/*
 * @Description: 
 * @Author: Aroma
 * @Date: 2024-09-24 15:19:25
 * @LastEditors: Aroma
 * @LastEditTime: 2024-09-24 16:50:19
 * @别瞎看: 你个无脑牛马
 */
abstract class A{
    abstract void show();
}
class B extends A{
    public void show(){
        System.out.println("B");
    }
}
class Main{
    public static void main(String[] args){
        A a=new B();
        a.show();
    }
}